//1. 引入 react
import React from 'react';
//2. 引入 React-DOM
import ReactDOM from 'react-dom';
import App from './App';
//3. 创建虚拟 DOM   
// let vDOM = <h2>Hello React 脚手架</h2>;
//4. 渲染
ReactDOM.render(<App />, document.querySelector('#root'));